Huancayo, Peru, January 1956-December 1959, Instituto Geofisico de Huancayo
Cheltenham, Maryland, January 1956-October 4, 1956 and Fredericksburg, Virginia, October 5, 1956-December 1959, U.S. Coast and Geodetic Survey, Cheltenham Magnetic Observatory, Fredericksburg Magnetic ObservatoryChristchurch, New Zealand, January 1956-June 1959, Department of Scientific and Industrial Research, Magnetic Survey DivisionGodhavn, Greenland, January 1954-July 1959, Det Danske Meteorogiske Institut, Geofysisk ObservatoriumUnidersidad Nacional de Mexico, July 1957-December 1958, Instituto de GeofisicaCarnegie Institution of Washington publication 175, vol. XXI"Researches of the Department of Terrestrial Magnetism, vol. XXI"
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